--- old/src/hotspot/os_cpu/linux_sparc/os_linux_sparc.cpp 2020-05-01 02:29:45.072449592 -0700 +++ /dev/null 2020-03-09 18:57:19.455001459 -0700 @@ -1,686 +0,0 @@ -/* - * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - * - */ - -// no precompiled headers -#include "jvm.h" -#include "asm/macroAssembler.hpp" -#include "classfile/classLoader.hpp" -#include "classfile/systemDictionary.hpp" -#include "classfile/vmSymbols.hpp" -#include "code/codeCache.hpp" -#include "code/icBuffer.hpp" -#include "code/vtableStubs.hpp" -#include "interpreter/interpreter.hpp" -#include "memory/allocation.inline.hpp" -#include "nativeInst_sparc.hpp" -#include "os_share_linux.hpp" -#include "prims/jniFastGetField.hpp" -#include "prims/jvm_misc.hpp" -#include "runtime/arguments.hpp" -#include "runtime/extendedPC.hpp" -#include "runtime/frame.inline.hpp" -#include "runtime/interfaceSupport.inline.hpp" -#include "runtime/java.hpp" -#include "runtime/javaCalls.hpp" -#include "runtime/mutexLocker.hpp" -#include "runtime/osThread.hpp" -#include "runtime/safepointMechanism.hpp" -#include "runtime/sharedRuntime.hpp" -#include "runtime/stubRoutines.hpp" -#include "runtime/thread.inline.hpp" -#include "runtime/timer.hpp" -#include "utilities/debug.hpp" -#include "utilities/events.hpp" -#include "utilities/vmError.hpp" - -// Linux/Sparc has rather obscure naming of registers in sigcontext -// different between 32 and 64 bits -#define SIG_PC(x) ((x)->sigc_regs.tpc) -#define SIG_NPC(x) ((x)->sigc_regs.tnpc) -#define SIG_REGS(x) ((x)->sigc_regs) - -// those are to reference registers in sigcontext -enum { - CON_G0 = 0, - CON_G1, - CON_G2, - CON_G3, - CON_G4, - CON_G5, - CON_G6, - CON_G7, - CON_O0, - CON_O1, - CON_O2, - CON_O3, - CON_O4, - CON_O5, - CON_O6, - CON_O7, -}; - -// For Forte Analyzer AsyncGetCallTrace profiling support - thread is -// currently interrupted by SIGPROF. -// os::Solaris::fetch_frame_from_ucontext() tries to skip nested -// signal frames. Currently we don't do that on Linux, so it's the -// same as os::fetch_frame_from_context(). -ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, - const ucontext_t* uc, - intptr_t** ret_sp, - intptr_t** ret_fp) { - assert(thread != NULL, "just checking"); - assert(ret_sp != NULL, "just checking"); - assert(ret_fp != NULL, "just checking"); - - return os::fetch_frame_from_context(uc, ret_sp, ret_fp); -} - -ExtendedPC os::fetch_frame_from_context(const void* ucVoid, - intptr_t** ret_sp, - intptr_t** ret_fp) { - const ucontext_t* uc = (const ucontext_t*) ucVoid; - ExtendedPC epc; - - if (uc != NULL) { - epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); - if (ret_sp) { - *ret_sp = os::Linux::ucontext_get_sp(uc); - } - if (ret_fp) { - *ret_fp = (intptr_t*)NULL; - } - } else { - // construct empty ExtendedPC for return value checking - epc = ExtendedPC(NULL); - if (ret_sp) { - *ret_sp = (intptr_t*) NULL; - } - if (ret_fp) { - *ret_fp = (intptr_t*) NULL; - } - } - - return epc; -} - -frame os::fetch_frame_from_context(const void* ucVoid) { - intptr_t* sp; - ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, NULL); - return frame(sp, frame::unpatchable, epc.pc()); -} - -frame os::get_sender_for_C_frame(frame* fr) { - return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc()); -} - -frame os::current_frame() { - intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); - frame myframe(sp, frame::unpatchable, - CAST_FROM_FN_PTR(address, os::current_frame)); - if (os::is_first_C_frame(&myframe)) { - // stack is not walkable - return frame(NULL, frame::unpatchable, NULL); - } else { - return os::get_sender_for_C_frame(&myframe); - } -} - -address os::current_stack_pointer() { - register void *sp __asm__ ("sp"); - return (address)sp; -} - -char* os::non_memory_address_word() { - // Must never look like an address returned by reserve_memory, - // even in its subfields (as defined by the CPU immediate fields, - // if the CPU splits constants across multiple instructions). - // On SPARC, 0 != %hi(any real address), because there is no - // allocation in the first 1Kb of the virtual address space. - return (char*) 0; -} - -void os::print_context(outputStream *st, const void *context) { - if (context == NULL) return; - - const ucontext_t* uc = (const ucontext_t*)context; - sigcontext* sc = (sigcontext*)context; - st->print_cr("Registers:"); - - st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT - " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, - SIG_REGS(sc).u_regs[CON_G1], - SIG_REGS(sc).u_regs[CON_G2], - SIG_REGS(sc).u_regs[CON_G3], - SIG_REGS(sc).u_regs[CON_G4]); - st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT - " G7=" INTPTR_FORMAT " Y=0x%x", - SIG_REGS(sc).u_regs[CON_G5], - SIG_REGS(sc).u_regs[CON_G6], - SIG_REGS(sc).u_regs[CON_G7], - SIG_REGS(sc).y); - st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT - " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, - SIG_REGS(sc).u_regs[CON_O0], - SIG_REGS(sc).u_regs[CON_O1], - SIG_REGS(sc).u_regs[CON_O2], - SIG_REGS(sc).u_regs[CON_O3]); - st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT - " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, - SIG_REGS(sc).u_regs[CON_O4], - SIG_REGS(sc).u_regs[CON_O5], - SIG_REGS(sc).u_regs[CON_O6], - SIG_REGS(sc).u_regs[CON_O7]); - - - intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); - st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT - " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, - sp[L0->sp_offset_in_saved_window()], - sp[L1->sp_offset_in_saved_window()], - sp[L2->sp_offset_in_saved_window()], - sp[L3->sp_offset_in_saved_window()]); - st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT - " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, - sp[L4->sp_offset_in_saved_window()], - sp[L5->sp_offset_in_saved_window()], - sp[L6->sp_offset_in_saved_window()], - sp[L7->sp_offset_in_saved_window()]); - st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT - " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, - sp[I0->sp_offset_in_saved_window()], - sp[I1->sp_offset_in_saved_window()], - sp[I2->sp_offset_in_saved_window()], - sp[I3->sp_offset_in_saved_window()]); - st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT - " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, - sp[I4->sp_offset_in_saved_window()], - sp[I5->sp_offset_in_saved_window()], - sp[I6->sp_offset_in_saved_window()], - sp[I7->sp_offset_in_saved_window()]); - - st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, - SIG_PC(sc), - SIG_NPC(sc)); - st->cr(); - st->cr(); - - st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp)); - print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); - st->cr(); - - // Note: it may be unsafe to inspect memory near pc. For example, pc may - // point to garbage if entry point in an nmethod is corrupted. Leave - // this at the end, and hope for the best. - address pc = os::Linux::ucontext_get_pc(uc); - print_instructions(st, pc, sizeof(char)); - st->cr(); -} - - -void os::print_register_info(outputStream *st, const void *context) { - if (context == NULL) return; - - const ucontext_t *uc = (const ucontext_t*)context; - const sigcontext* sc = (const sigcontext*)context; - intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); - - st->print_cr("Register to memory mapping:"); - st->cr(); - - // this is only for the "general purpose" registers - st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]); - st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]); - st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]); - st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]); - st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]); - st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]); - st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]); - st->cr(); - - st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]); - st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]); - st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]); - st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]); - st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]); - st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]); - st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]); - st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]); - st->cr(); - - st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); - st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); - st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); - st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); - st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); - st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); - st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); - st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); - st->cr(); - - st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); - st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); - st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); - st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); - st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); - st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); - st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); - st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); - st->cr(); -} - - -address os::Linux::ucontext_get_pc(const ucontext_t* uc) { - return (address) SIG_PC((sigcontext*)uc); -} - -void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) { - sigcontext* ctx = (sigcontext*) uc; - SIG_PC(ctx) = (intptr_t)pc; - SIG_NPC(ctx) = (intptr_t)(pc+4); -} - -intptr_t* os::Linux::ucontext_get_sp(const ucontext_t *uc) { - return (intptr_t*) - ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); -} - -// not used on Sparc -intptr_t* os::Linux::ucontext_get_fp(const ucontext_t *uc) { - ShouldNotReachHere(); - return NULL; -} - -// Utility functions - -inline static bool checkPrefetch(sigcontext* uc, address pc) { - if (StubRoutines::is_safefetch_fault(pc)) { - os::Linux::ucontext_set_pc((ucontext_t*)uc, StubRoutines::continuation_for_safefetch_fault(pc)); - return true; - } - return false; -} - -inline static bool checkOverflow(sigcontext* uc, - address pc, - address addr, - JavaThread* thread, - address* stub) { - // check if fault address is within thread stack - if (thread->is_in_full_stack(addr)) { - // stack overflow - if (thread->in_stack_yellow_reserved_zone(addr)) { - thread->disable_stack_yellow_reserved_zone(); - if (thread->thread_state() == _thread_in_Java) { - // Throw a stack overflow exception. Guard pages will be reenabled - // while unwinding the stack. - *stub = - SharedRuntime::continuation_for_implicit_exception(thread, - pc, - SharedRuntime::STACK_OVERFLOW); - } else { - // Thread was in the vm or native code. Return and try to finish. - return true; - } - } else if (thread->in_stack_red_zone(addr)) { - // Fatal red zone violation. Disable the guard pages and fall through - // to handle_unexpected_exception way down below. - thread->disable_stack_red_zone(); - tty->print_raw_cr("An irrecoverable stack overflow has occurred."); - - // This is a likely cause, but hard to verify. Let's just print - // it as a hint. - tty->print_raw_cr("Please check if any of your loaded .so files has " - "enabled executable stack (see man page execstack(8))"); - } else { - // Accessing stack address below sp may cause SEGV if current - // thread has MAP_GROWSDOWN stack. This should only happen when - // current thread was created by user code with MAP_GROWSDOWN flag - // and then attached to VM. See notes in os_linux.cpp. - if (thread->osthread()->expanding_stack() == 0) { - thread->osthread()->set_expanding_stack(); - if (os::Linux::manually_expand_stack(thread, addr)) { - thread->osthread()->clear_expanding_stack(); - return true; - } - thread->osthread()->clear_expanding_stack(); - } else { - fatal("recursive segv. expanding stack."); - } - } - } - return false; -} - -inline static bool checkPollingPage(address pc, address fault, address* stub) { - if (SafepointMechanism::is_poll_address(fault)) { - *stub = SharedRuntime::get_poll_stub(pc); - return true; - } - return false; -} - -inline static bool checkByteBuffer(address pc, address npc, JavaThread * thread, address* stub) { - // BugId 4454115: A read from a MappedByteBuffer can fault - // here if the underlying file has been truncated. - // Do not crash the VM in such a case. - CodeBlob* cb = CodeCache::find_blob_unsafe(pc); - CompiledMethod* nm = cb->as_compiled_method_or_null(); - bool is_unsafe_arraycopy = (thread->doing_unsafe_access() && UnsafeCopyMemory::contains_pc(pc)); - if ((nm != NULL && nm->has_unsafe_access()) || is_unsafe_arraycopy) { - if (is_unsafe_arraycopy) { - npc = UnsafeCopyMemory::page_error_continue_pc(pc); - } - *stub = SharedRuntime::handle_unsafe_access(thread, npc); - return true; - } - return false; -} - -inline static bool checkVerifyOops(address pc, address fault, address* stub) { - if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] - && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { - *stub = MacroAssembler::_verify_oop_implicit_branch[2]; - warning("fixed up memory fault in +VerifyOops at address " - INTPTR_FORMAT, p2i(fault)); - return true; - } - return false; -} - -inline static bool checkFPFault(address pc, int code, - JavaThread* thread, address* stub) { - if (code == FPE_INTDIV || code == FPE_FLTDIV) { - *stub = - SharedRuntime:: - continuation_for_implicit_exception(thread, - pc, - SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); - return true; - } - return false; -} - -inline static bool checkNullPointer(address pc, void* fault, - JavaThread* thread, address* stub) { - if (MacroAssembler::uses_implicit_null_check(fault)) { - // Determination of interpreter/vtable stub/compiled code null - // exception - *stub = - SharedRuntime:: - continuation_for_implicit_exception(thread, pc, - SharedRuntime::IMPLICIT_NULL); - return true; - } - return false; -} - -inline static bool checkFastJNIAccess(address pc, address* stub) { - address addr = JNI_FastGetField::find_slowcase_pc(pc); - if (addr != (address)-1) { - *stub = addr; - return true; - } - return false; -} - -inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { - if (nativeInstruction_at(*pc)->is_zombie()) { - // zombie method (ld [%g0],%o7 instruction) - *stub = SharedRuntime::get_handle_wrong_method_stub(); - - // At the stub it needs to look like a call from the caller of this - // method (not a call from the segv site). - *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; - return true; - } - return false; -} - -inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { -#ifdef COMPILER2 - if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { -#ifdef ASSERT -#ifdef TIERED - CodeBlob* cb = CodeCache::find_blob_unsafe(*pc); - assert(cb->is_compiled_by_c2(), "Wrong compiler"); -#endif // TIERED -#endif // ASSERT - // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. - *stub = SharedRuntime::get_ic_miss_stub(); - // At the stub it needs to look like a call from the caller of this - // method (not a call from the segv site). - *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; - return true; - } -#endif // COMPILER2 - return false; -} - -extern "C" JNIEXPORT int -JVM_handle_linux_signal(int sig, - siginfo_t* info, - void* ucVoid, - int abort_if_unrecognized) { - // in fact this isn't ucontext_t* at all, but struct sigcontext* - // but Linux porting layer uses ucontext_t, so to minimize code change - // we cast as needed - ucontext_t* ucFake = (ucontext_t*) ucVoid; - sigcontext* uc = (sigcontext*)ucVoid; - - Thread* t = Thread::current_or_null_safe(); - - // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away - // (no destructors can be run) - os::ThreadCrashProtection::check_crash_protection(sig, t); - - SignalHandlerMark shm(t); - - // Note: it's not uncommon that JNI code uses signal/sigset to install - // then restore certain signal handler (e.g. to temporarily block SIGPIPE, - // or have a SIGILL handler when detecting CPU type). When that happens, - // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To - // avoid unnecessary crash when libjsig is not preloaded, try handle signals - // that do not require siginfo/ucontext first. - - if (sig == SIGPIPE || sig == SIGXFSZ) { - // allow chained handler to go first - if (os::Linux::chained_handler(sig, info, ucVoid)) { - return true; - } else { - // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 - return true; - } - } - -#ifdef CAN_SHOW_REGISTERS_ON_ASSERT - if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) { - if (handle_assert_poison_fault(ucVoid, info->si_addr)) { - return 1; - } - } -#endif - - JavaThread* thread = NULL; - VMThread* vmthread = NULL; - if (os::Linux::signal_handlers_are_installed) { - if (t != NULL ){ - if(t->is_Java_thread()) { - thread = (JavaThread*)t; - } - else if(t->is_VM_thread()){ - vmthread = (VMThread *)t; - } - } - } - - // decide if this trap can be handled by a stub - address stub = NULL; - address pc = NULL; - address npc = NULL; - - //%note os_trap_1 - if (info != NULL && uc != NULL && thread != NULL) { - pc = address(SIG_PC(uc)); - npc = address(SIG_NPC(uc)); - - if (checkPrefetch(uc, pc)) { - return 1; - } - - // Handle ALL stack overflow variations here - if (sig == SIGSEGV) { - if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { - return 1; - } - } - - if (sig == SIGBUS && - (thread->thread_state() == _thread_in_vm || - thread->thread_state() == _thread_in_native) && - thread->doing_unsafe_access()) { - if (UnsafeCopyMemory::contains_pc(pc)) { - npc = UnsafeCopyMemory::page_error_continue_pc(pc); - } - stub = SharedRuntime::handle_unsafe_access(thread, npc); - } - - if (thread->thread_state() == _thread_in_Java) { - do { - // Java thread running in Java code => find exception handler if any - // a fault inside compiled code, the interpreter, or a stub - - if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { - break; - } - - if ((sig == SIGBUS) && checkByteBuffer(pc, npc, thread, &stub)) { - break; - } - - if ((sig == SIGSEGV || sig == SIGBUS) && - checkVerifyOops(pc, (address)info->si_addr, &stub)) { - break; - } - - if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { - break; - } - - if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { - break; - } - - if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { - break; - } - - if ((sig == SIGSEGV) && - checkNullPointer(pc, info->si_addr, thread, &stub)) { - break; - } - } while (0); - - // jni_fast_GetField can trap at certain pc's if a GC kicks in - // and the heap gets shrunk before the field access. - if ((sig == SIGSEGV) || (sig == SIGBUS)) { - checkFastJNIAccess(pc, &stub); - } - } - - if (stub != NULL) { - // save all thread context in case we need to restore it - thread->set_saved_exception_pc(pc); - thread->set_saved_exception_npc(npc); - os::Linux::ucontext_set_pc((ucontext_t*)uc, stub); - return true; - } - } - - // signal-chaining - if (os::Linux::chained_handler(sig, info, ucVoid)) { - return true; - } - - if (!abort_if_unrecognized) { - // caller wants another chance, so give it to him - return false; - } - - if (pc == NULL && uc != NULL) { - pc = os::Linux::ucontext_get_pc((const ucontext_t*)uc); - } - - // unmask current signal - sigset_t newset; - sigemptyset(&newset); - sigaddset(&newset, sig); - sigprocmask(SIG_UNBLOCK, &newset, NULL); - - VMError::report_and_die(t, sig, pc, info, ucVoid); - - ShouldNotReachHere(); - return false; -} - -void os::Linux::init_thread_fpu_state(void) { - // Nothing to do -} - -int os::Linux::get_fpu_control_word() { - return 0; -} - -void os::Linux::set_fpu_control_word(int fpu) { - // nothing -} - -bool os::is_allocatable(size_t bytes) { - return true; -} - -/////////////////////////////////////////////////////////////////////////////// -// thread stack - -// Minimum usable stack sizes required to get to user code. Space for -// HotSpot guard pages is added later. -size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K; -size_t os::Posix::_java_thread_min_stack_allowed = 64 * K; -size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K; - -// return default stack size for thr_type -size_t os::Posix::default_stack_size(os::ThreadType thr_type) { - // default stack size (compiler thread needs larger stack) - size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); - return s; -} - -#ifndef PRODUCT -void os::verify_stack_alignment() { -} -#endif - -int os::extra_bang_size_in_bytes() { - // SPARC does not require the additional stack bang. - return 0; -}